SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5cefdff64d7cbb51cf9c44a7a609520227b9675ef33a076dc2222c66285a828d' 
  AND token = 'EAO8B/E+6tYNOOldSGLTQotMCJ0ZWHL7Mj5CEvRVFrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}